Operations | Monitoring | ITSM | DevOps | Cloud

OnlineOrNot's lessons from Cloudflare's outage on 2025-11-18

On 2025-11-18 at 11:48 UTC, Cloudflare declared an incident affecting the global network (that also affected OnlineOrNot). OnlineOrNot monitors websites, APIs, web apps, and cron jobs, while providing status pages as well. While we partially mitigated the issue by enabling a fallback to AWS-based monitoring, between 13:00 UTC and 14:33 UTC failing checks went unreported, heartbeat checks over-reported, and status pages were unavailable.

OnlineOrNot updates from May 2025

As OnlineOrNot has grown, I've been building features quickly to get them into your hands as fast as possible. However, this meant I ended up with multiple versions of similar pages that looked and worked differently from each other. This month, I focused on putting systems in place to create a consistent experience across all parts of the dashboard, making everything look and feel unified.

How to get alerted when your EC2 instance shuts down

Some of your most critical infrastructure runs on AWS EC2, so it's pretty damn important to know when your EC2 instances shut down. Sure, chances are someone in your organisation will start kicking and screaming within 30 minutes of a particularly important instance shutting down, but we can do better than that. When it comes to monitoring and customers (whether inside your org or outside), being proactive wins you a lot of points.